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help with data type sizes
Post 302488837 by Driver on Tuesday 18th of January 2011 02:23:59 PM
01-18-2011
I guess what prompted all this was the following remark (which I might even have overlooked since I didn't read the entire thread in detail):
Certainly I agree that the properties of scope, duration and even limitations should be understood.
However I disagree that the address space layout is a good tool to do this.
The address printed by the original poster happened to have a "high" address, so high that it will have the sign bit set if looked at through a signed integer. That is all there is to know at this (and most any) stage, IMO (which you are free to disagree with and I'm not going to argue about
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Quote:
Since they're in stack space their addresses are very high, and end up flipping over to negative when you print them as signed integers.
However I disagree that the address space layout is a good tool to do this.
The address printed by the original poster happened to have a "high" address, so high that it will have the sign bit set if looked at through a signed integer. That is all there is to know at this (and most any) stage, IMO (which you are free to disagree with and I'm not going to argue about
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values
values.h(3HEAD) Headers values.h(3HEAD) NAME
values.h, values - machine-dependent values SYNOPSIS
#include <values.h> DESCRIPTION
This file contains a set of manifest constants, conditionally defined for particular processor architectures. The model assumed for integers is binary representation (one's or two's complement), where the sign is represented by the value of the high-order bit. BITS(type) The number of bits in a specified type (for example, int). HIBITS The value of a short integer with only the high-order bit set. HIBITL The value of a long integer with only the high-order bit set. HIBITI The value of a regular integer with only the high-order bit set. MAXSHORT The maximum value of a signed short integer. MAXLONG The maximum value of a signed long integer. MAXINT The maximum value of a signed regular integer. MAXFLOAT, LN_MAXFLOAT The maximum value of a single-precision floating-point number, and its natural logarithm. MAXDOUBLE, LN_MAXDOUBLE The maximum value of a double-precision floating-point number, and its natural logarithm. MINFLOAT, LN_MINFLOAT The minimum positive value of a single-precision floating-point number, and its natural logarithm. MINDOUBLE, LN_MINDOUBLE The minimum positive value of a double-precision floating-point number, and its natural logarithm. FSIGNIF The number of significant bits in the mantissa of a single-precision floating-point number. DSIGNIF The number of significant bits in the mantissa of a double-precision floating-point number. SEE ALSO
intro(3) math.h(3HEAD) SunOS 5.10 2 Mar 1993 values.h(3HEAD)